added iOS source code

[wl-app.git] / iOS / Pods / Kingfisher / Sources / ImageTransition.swift

diff --git a/iOS/Pods/Kingfisher/Sources/ImageTransition.swift b/iOS/Pods/Kingfisher/Sources/ImageTransition.swift
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+//
+//  ImageTransition.swift
+//  Kingfisher
+//
+//  Created by Wei Wang on 15/9/18.
+//
+//  Copyright (c) 2018 Wei Wang <onevcat@gmail.com>
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(macOS)
+// Not implemented for macOS and watchOS yet.
+    
+import AppKit
+
+/// Image transition is not supported on macOS.
+public enum ImageTransition {
+    case none
+    var duration: TimeInterval {
+        return 0
+    }
+}
+
+#elseif os(watchOS)
+import UIKit
+/// Image transition is not supported on watchOS.
+public enum ImageTransition {
+    case none
+    var duration: TimeInterval {
+        return 0
+    }
+}
+#else
+import UIKit
+
+/**
+Transition effect which will be used when an image downloaded and set by `UIImageView` extension API in Kingfisher.
+You can assign an enum value with transition duration as an item in `KingfisherOptionsInfo` 
+to enable the animation transition.
+
+Apple's UIViewAnimationOptions is used under the hood.
+For custom transition, you should specified your own transition options, animations and 
+comletion handler as well.
+*/
+public enum ImageTransition {
+    ///  No animation transistion.
+    case none
+    
+    /// Fade in the loaded image.
+    case fade(TimeInterval)
+
+    /// Flip from left transition.
+    case flipFromLeft(TimeInterval)
+
+    /// Flip from right transition.
+    case flipFromRight(TimeInterval)
+    
+    /// Flip from top transition.
+    case flipFromTop(TimeInterval)
+    
+    /// Flip from bottom transition.
+    case flipFromBottom(TimeInterval)
+    
+    /// Custom transition.
+    case custom(duration: TimeInterval,
+                 options: UIViewAnimationOptions,
+              animations: ((UIImageView, UIImage) -> Void)?,
+              completion: ((Bool) -> Void)?)
+    
+    var duration: TimeInterval {
+        switch self {
+        case .none:                          return 0
+        case .fade(let duration):            return duration
+            
+        case .flipFromLeft(let duration):    return duration
+        case .flipFromRight(let duration):   return duration
+        case .flipFromTop(let duration):     return duration
+        case .flipFromBottom(let duration):  return duration
+            
+        case .custom(let duration, _, _, _): return duration
+        }
+    }
+    
+    var animationOptions: UIViewAnimationOptions {
+        switch self {
+        case .none:                         return []
+        case .fade(_):                      return .transitionCrossDissolve
+            
+        case .flipFromLeft(_):              return .transitionFlipFromLeft
+        case .flipFromRight(_):             return .transitionFlipFromRight
+        case .flipFromTop(_):               return .transitionFlipFromTop
+        case .flipFromBottom(_):            return .transitionFlipFromBottom
+            
+        case .custom(_, let options, _, _): return options
+        }
+    }
+    
+    var animations: ((UIImageView, UIImage) -> Void)? {
+        switch self {
+        case .custom(_, _, let animations, _): return animations
+        default: return { $0.image = $1 }
+        }
+    }
+    
+    var completion: ((Bool) -> Void)? {
+        switch self {
+        case .custom(_, _, _, let completion): return completion
+        default: return nil
+        }
+    }
+}
+#endif